1. How do I know what size meter I need?

You determine this not by matching pipe size, but rather by the flow rate of the water moving through the water line. Once you know your flow rate as measured by gallons per minute (gpm), you may then click on the “Technical Specification” icon at the top of this page. Each meter technical specification page defines maximum flow rates that our meters will handle. Please be advised that continual operation of a meter at/or close to the maximum gpm capacity defined may reduce the functional life of the meter. Carlon offers meters from ½” – 20”.